trie | Fast , zero heap allocation Go Trie for runes or paths | Natural Language Processing library

 by   dghubble Go Version: Current License: MIT

kandi X-RAY | trie Summary

kandi X-RAY | trie Summary

trie is a Go library typically used in Artificial Intelligence, Natural Language Processing, Example Codes applications. trie has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Package trie implements rune-wise and path-wise Tries optimized for Get performance and to allocate 0 bytes of heap memory (i.e. garbage) per Get. A typical use case is to perform any Put or Delete operations upfront to populate the trie, then perform Get operations very quickly. The Tries do not synchronize access (not thread-safe). When Tries are chosen over maps, it is typically for their space efficiency. However, in situations where direct key lookup is not possible (e.g. routers), tries can provide faster lookups and avoid key iteration.
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            kandi-support Support

              trie has a low active ecosystem.
              It has 353 star(s) with 51 fork(s). There are 13 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              trie has no issues reported. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of trie is current.

            kandi-Quality Quality

              trie has 0 bugs and 0 code smells.

            kandi-Security Security

              trie has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              trie code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              trie is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              trie releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.
              It has 863 lines of code, 57 functions and 8 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

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            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of trie
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            trie Key Features

            No Key Features are available at this moment for trie.

            trie Examples and Code Snippets

            Deletes a node from the trie .
            pythondot img1Lines of Code : 27dot img1License : Permissive (MIT License)
            copy iconCopy
            def delete(self, word: str) -> None:
                    """
                    Deletes a word in a Trie
                    :param word: word to delete
                    :return: None
                    """
            
                    def _delete(curr: TrieNode, word: str, index: int) -> bool:
                        if index ==  
            Main entry point to the trie .
            javadot img2Lines of Code : 21dot img2License : Permissive (MIT License)
            copy iconCopy
            public static void main(String[] args) {
                    TrieNode root = getNode();
                    insert(root, "hello");
                    insert(root, "dog");
                    insert(root, "hell");
                    insert(root, "cat");
                    insert(root, "a");
                    insert(root, "hel");  
            Recursive search for suggestions in the given Trie .
            javadot img3Lines of Code : 21dot img3License : Permissive (MIT License)
            copy iconCopy
            static void suggestionsRec(TrieNode root, String currPrefix) {
                    // found a string in Trie with the given prefix 
                    if (root.isWordEnd) {
                        System.out.println(currPrefix);
                    }
            
                    // All children struct node pointers   

            Community Discussions

            QUESTION

            split strings with backtracking
            Asked 2022-Mar-03 at 16:45

            I'm trying to write a code that split a spaceless string into meaningful words but when I give sentence like "arealways" it returns ['a', 'real', 'ways'] and what I want is ['are', 'always'] and my dictionary contains all this words. How can I can write a code that keep backtracking till find the best matching?

            the code that returns 'a', 'real', 'ways':

            splitter.java:

            ...

            ANSWER

            Answered 2022-Mar-03 at 16:45

            Using the OP's split method and the implementation of Trie found in The Trie Data Structure in Java Baeldung's article, I was able to get the following results:

            Source https://stackoverflow.com/questions/71338421

            QUESTION

            Can you safely change a Python object's type in a C extension?
            Asked 2022-Mar-02 at 01:55
            Question

            Suppose that I have implemented two Python types using the C extension API and that the types are identical (same data layouts/C struct) with the exception of their names and a few methods. Assuming that all methods respect the data layout, can you safely change the type of an object from one of these types into the other in a C function?

            Notably, as of Python 3.9, there appears to be a function Py_SET_TYPE, but the documentation is not clear as to whether/when this is safe to do. I'm interested in knowing both how to use this function safely and whether types can be safely changed prior to version 3.9.

            Motivation

            I'm writing a Python C extension to implement a Persistent Hash Array Mapped Trie (PHAMT); in case it's useful, the source code is here (as of writing, it is at this commit). A feature I would like to add is the ability to create a Transient Hash Array Mapped Trie (THAMT) from a PHAMT. THAMTs can be created from PHAMTs in O(1) time and can be mutated in-place efficiently. Critically, THAMTs have the exact same underlying C data-structure as PHAMTs—the only real difference between a PHAMT and a THAMT is a few methods encapsulated by their Python types. This common structure allows one to very efficiently turn a THAMT back into a PHAMT once one has finished performing a set of edits. (This pattern typically reduces the number of memory allocations when performing a large number of updates to a PHAMT).

            A very convenient way to implement the conversion from THAMT to PHAMT would be to simply change the type pointers of the THAMT objects from the THAMT type to the PHAMT type. I am confident that I can write code that safely navigates this change, but I can imagine that doing so might, for example, break the Python garbage collector.

            (To be clear: the motivation is just context as to how the question arose. I'm not looking for help implementing the structures described in the Motivation, I'm looking for an answer to the Question, above.)

            ...

            ANSWER

            Answered 2022-Mar-02 at 01:13

            According to the language reference, chapter 3 "Data model" (see here):

            An object’s type determines the operations that the object supports (e.g., “does it have a length?”) and also defines the possible values for objects of that type. The type() function returns an object’s type (which is an object itself). Like its identity, an object’s type is also unchangeable.[1]

            which, to my mind states that the type must never change, and changing it would be illegal as it would break the language specification. The footnote however states that

            [1] It is possible in some cases to change an object’s type, under certain controlled conditions. It generally isn’t a good idea though, since it can lead to some very strange behaviour if it is handled incorrectly.

            I don't know of any method to change the type of an object from within python itself, so the "possible" may indeed refer to the CPython function.

            As far as I can see a PyObject is defined internally as a

            Source https://stackoverflow.com/questions/71178416

            QUESTION

            How can I build an immutable tree datastructure in Scala?
            Asked 2022-Jan-12 at 01:10

            I am attempting to construct an immutable Trie defined as such:

            ...

            ANSWER

            Answered 2022-Jan-12 at 01:10

            The appears to get at what you're after.

            Source https://stackoverflow.com/questions/70670816

            QUESTION

            Difference between "key in dict" and "dict.get(key)" on key check
            Asked 2022-Jan-06 at 06:43

            When I was doing Leetcode 820, building a Trie, there is a bug in my code. I found it, also corrected it, but did NOT understand why. Could anyone help?

            I made a simple test code here. Program 1 and Program 2 are doing same thing, that is, given a word list words, it builds a Trie in reversed order of these words. Variable trie stored the root of Trie, variable leaves stored beginning character of each word. The only difference between program 1 and program 2 is in line # difference, and I focus on the different results of leaves in 2 programs.

            ...

            ANSWER

            Answered 2022-Jan-06 at 06:27

            One obvious difference:

            • key in dict will only give you a false value if the key is not there.
            • dict.get(key) will give you the actual value for that key which is then treated as a truthy or falsey value. So, if the value for an existing key is falsey (such as zero or the empty string), the if statement will not fire (though it will in the previous bullet point).

            The following example shows this:

            Source https://stackoverflow.com/questions/70603241

            QUESTION

            How can I update a mutable reference in a loop?
            Asked 2022-Jan-02 at 02:56

            I'm trying to implement a Trie/Prefix Tree in Rust and I'm having trouble with the borrow checker. Here is my implementation so far and I'm getting an error when I call children.insert.

            cannot borrow *children as mutable because it is also borrowed as immutable

            ...

            ANSWER

            Answered 2022-Jan-02 at 00:25

            When you're doing multiple things with a single key (like find or insert and get) and run into borrow trouble, try using the Entry API (via .entry()):

            Source https://stackoverflow.com/questions/70552754

            QUESTION

            How to find list of unique affixes given a list of words?
            Asked 2021-Dec-29 at 21:45

            An affix can be a prefix (before word), infix (in the middle of a word), or suffix (after word). I have a list of 200k+ latin/greek names used in biological taxonomy. It turns out there is no centralized list of all the affixes used in the taxonomy, unfortunately, other than this very basic list.

            The question is, how can I take that 200k+ list of latin/greek names, and divide it into a list of affixes (ideally using just plain JavaScript)?

            I don't really know where to begin on this one. If I construct a trie, I need to somehow instead test for specific chunks of words. Or if the chunk can be extended, don't include the chunk until we reach a final extension of some sort...

            ...

            ANSWER

            Answered 2021-Dec-21 at 02:53

            Here is a simple approach, but it is probably in the hours period. Also, you could do it in JavaScript, but I'll take a generally Unixy approach that you could write in any language because that is simple to think about.

            First, let's take your file, and add markers to the start/end of each word, and spaces between the letters. So your example would become:

            Source https://stackoverflow.com/questions/70427904

            QUESTION

            Why isn't a trie index used in databases for string indexing?
            Asked 2021-Dec-24 at 13:46

            My question is in the title. It seems the Trie tree is quite fit for string indexing, and why is it that no mainstream databases use it as an indexing strategy.

            ...

            ANSWER

            Answered 2021-Dec-24 at 13:46

            Disks or SSDs are read in blocks, and the B+Tree indexes that databases use are optimized according to that structure. The B+Tree minimizes the average number of blocks you have to read to perform a lookup. They also allow you to update the index without changing too many blocks, and maximize the utility of cache.

            Tries don't have these advantages. The one advantage they do provide is compressed storage of common prefixes, but for the short strings that are usually used as DB keys, that isn't much of an advantage. Sometimes specialized index structures are built to compress common prefixes, but again they're designed around the block structure of the storage.

            Source https://stackoverflow.com/questions/70472468

            QUESTION

            How is the Root Node being updated when child nodes are the ones updated when performing Tree modifications?
            Asked 2021-Dec-03 at 04:53

            How does a Tree's parent node get updated with the child updates we perform? Specifically like when you do a BFS or DFS search, perform a check at the node, and then update that node. What causes in memory or in the programming language to know "Oh hey, I have to make this update to the Root node as well!"

            In my example I'm using a Trie (not really important but I will just refer to it as a Tree). I have this BFS search below that searches through a bunch of nodes and will update with a specific word value. The comment I have is where my question lies. That child node is currently stored in "deque." How does the program know I mean to update the value within Root, not just the value pass into the variable "deque?"

            To me, what I think SHOULD be happening is Root shouldn't be updated and the only thing that gets updated is the variable "deque," and then after it's done, everything gets garbage collected and Root remains the same. Instead, Root gets updated when "deque" gets updated. Perhaps I missed this in my Data Structures course, but it has been bugging me for a while now and I've been having trouble finding resources that explain this.

            ...

            ANSWER

            Answered 2021-Dec-03 at 04:53

            I think you are encountering what is roughly a pass by value vs pass by reference issue. When a function is pass by value, the parameter of that function is copied such that the function gets its own distinct version and the caller won't see changes the function makes to the parameter. However, if a function is pass by reference, no copy is made and if the function makes changes to a parameter the caller will see the changes that were made.

            C# and Java are a little funny here because they are always pass by value (unless you explicitly tell C# to do otherwise), but they "pass references by value" too. That is, when you pass a function a reference type (like an object or a class), what the function receives is a copy of the reference to it (not a deep copy of the underlying object). This means the underlying object can still be changed inside a function, because that function has its own reference to it.

            A consequence of this is that when you pass the Enqueue method a reference type, as your Node objects are, what is stored in the queue are just (copies of) references to the same underlying objects which live outside the queue. That is, the elements of your queue are not deep copies of your tree's nodes: they are references to the same underlying Node objects. When you Deque() into the "deque" variable you're therefore just creating another alias which refers to some node which you might otherwise have been able to reach in a traversal directly from the Root node. This way, when you modify the properties of the "deque" node, you're directly modifying the properties of some Node object as it exists in the tree under the Root node—not a copy of that object with its own address in memory but the same underlying object.

            This is why when deque gets garbage collected the changes persist: deque just contained copies of references to the nodes which already existed in the Root tree. There's nothing your program had to figure out to know to make the changes you made via deque also affect nodes in the Root tree. Because deque contained references to those same underlying nodes, changes made through it were already directly modifying those nodes, and so after deque went out of scope the changes naturally persisted.

            Source https://stackoverflow.com/questions/70194688

            QUESTION

            why node-sass does'nt work in netlify when I deploy the app?
            Asked 2021-Nov-06 at 06:51

            I have this error when I add node-sass to my react app, I can't deploy the app in netlify I trie to use all build cmd like CI= run build please check the result in below, the app is deployed in netlify when I remove node sass from my app and is work help me if you can or tell me if you need more information

            ...

            ANSWER

            Answered 2021-Nov-06 at 06:51

            This probably seems to be a version mismatch error. Downgrading the Node version to something like 12.8.0 worked for me. To do the same in Netlify, go to Build & Deploy -> Environment and add the NODE_VERSION environment variable. Refer below attached screenshot:

            Source https://stackoverflow.com/questions/69854131

            QUESTION

            How do I initialize all elements of TrieNodes' children to null
            Asked 2021-Nov-01 at 14:35

            I am trying to solve a Trie problem, for which I create a TrieNode class as below:

            ...

            ANSWER

            Answered 2021-Oct-27 at 15:19

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install trie

            You can download it from GitHub.

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